[PWGHF] First draft of Omegac0 to OmegaPi QA workflow

[mtorresc15]

First draft of the QA workflow for the Omegac0 to OmegaPi analysis.

This PR introduces dedicated QA versions of the candidate selector, tree creator, analysis task, and ML response to allow a more detailed validation of the Omegac0 to OmegaPi analysis workflow.

The main additions are:

• Candidate selector: QA monitoring of the selection steps, with dedicated DCAFitter and KFParticle processing.
• Tree creator: dedicated QA output tables containing additional reconstruction and selection information for DCAFitter and KFParticle candidates.
• ML response: common and reconstruction-specific ML input features for both DCAFitter and KFParticle.
• Analysis task: processing DCAFitter and KFParticle candidates, with and without ML selections.

The implementation is based on the existing Omegac0 to OmegaPi analysis workflow and is intended to facilitate validation and comparison of the DCAFitter and KFParticle reconstruction and selection strategies.

This PR is opened as a draft for preliminary review and feedback.

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 3 warnings, 🔕 0 disabled

[Copilot]

Copilot review overview

🟡 Changes recommended

The new executables lack build registration, and selector issues can alter cuts or fatally terminate ML workflows.

Review effort: Balanced
Findings: 4 · 2 · 1

Open (7)

• Register QA analysis task source in CMake · New
• Guard ML inference for out-of-range candidate pT · New
• Register QA selector source in CMake · New
• Register QA tree creator source in CMake · New
• Use normalized V0 chi-square for threshold cuts · New
• Apply configurable pT-dependent bachelor-pion cuts · New
• Correct documentation to describe neutral Omegac decay · New

What changed in this PR

Adds QA workflows for comparing DCAFitter and KFParticle Ωc⁰→Ωπ reconstruction.

Changes:

• Adds QA candidate selection and output trees.
• Adds reconstruction-specific ML features.
• Adds data/MC analysis modes with optional ML and centrality.

File	Description
PWGHF/​TableProducer/​treeCreatorOmegac0ToOmegaPiQa.cxx	Defines detailed QA output tables.
PWGHF/​TableProducer/​candidateSelectorOmegac0ToOmegaPiQa.cxx	Implements selection, PID, ML, and QA monitoring.
PWGHF/​D2H/​Tasks/​taskOmegac0ToOmegaPiQa.cxx	Adds data and MC analysis modes.
PWGHF/​Core/​HfMlResponseOmegacToOmegaPiQa.h	Defines DCAFitter and KFParticle ML features.

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[vkucera]

@mtorresc15 Please fix the warnings.

[alibuild]

Error while checking build/O2Physics/code-check for bfe3dab at 2026-10-08 15:49:

No log files found

Full log here.

[alibuild]

Error while checking build/O2Physics/staging for b4bf9ad at 2026-10-08 18:13:

No log files found

Full log here.